Whisk vinegar, garlic, mustard and sugar in medium bowl. Gradually whisk in oil. Season vinaigrette to taste with salt and pepper. Place chicken breasts in medium bowl. Add 1/2 c vinaigrette; mix to coat chicken. Cover and refrigerate 1 hour. Allow remaining vinaigrette to stand at room temperature.,Meanwhile, add rice to heavy large saucepan of boiling salted water. Reduce heat to medium. Continue cooking until rice is tender and just beginning to split, stirring occasionally, ca. 50 mins. Drain. Rinse rice thoroughly under cold water. Drain well again.,______,Mix carrots, green onions, celery, walnuts, raisins, chopped dill, rice, in large bowl. Dress with remaining vinaigrette (you may have extra vinaigrette). Taste and correct seasoning, if necessary. Arrange chicken on top.